* {
  user-select: none;
}
body {
  //background: lightpink;

  .btn-replay {
    position: fixed;
    left: 30px;
    top: 30px;
  }

  .container {
    margin-top:  20px;
  }

  .card {
    display: inline-block;
    padding: 10px;
    border: 3px solid #91e0ff;

    span {
      display: block;
      float: left;
      width: 50px;
      height: 50px;
      text-align: center;
      line-height: 50px;
      margin-left: -1px;
      margin-top: -1px;
      font-size: 28px;
      //border: 1px solid red;
    }

    &.flipped {
      background: black;
      border-color: black;
      span {
        //border-color: black;
      }
    }
  }
}